[1.17.1] Description: Exception initializing level java.lang.NoClassDefFoundError: Could not initialize class

[DireTook]

Hey! I'm trying to create a custom structure and get the title error a little after clicking create world. I've attached the crash log, thanks in advance for any help.

crash-2021-08-12_22.46.33-server.txtFetching info...

[DireTook]

debug.logFetching info...

[DireTook]

I been further trying to figure this out and believe I've narrowed it down to my FMLCommonSetupEvent event. 

  Quote

    private void setup(final FMLCommonSetupEvent event) {
        event.enqueueWork(() -> {
            StructureInit.setupStructures();
            StructureInit.registerConfiguredStructures();
        });
    }

Expand  

It seems to call setup but not actually call either method inside the  event.enqueueWork() at any point. So my configured structure is never actually registered before my BiomeLoadingEvent event?

Do anyone know what would be causing this? 

[Luis_ST]

  On 8/14/2021 at 3:55 PM, DireTook said:

It seems to call setup but not actually call either method inside the  event.enqueueWork() at any point. So my configured structure is never actually registered before my BiomeLoadingEvent event?

Expand  

answer: do not use event.enqueueWork

[DireTook]

So I've essentially been trying to replicate this tutorial code as its the best info I could find on custom structures: https://github.com/TelepathicGrunt/StructureTutorialMod and it makes use of event.enqueueWork. I've tried replacing it but can't find anything else that would work.

You can see my methods in this gist: https://gist.github.com/DireTook/dd13728e54cc58a2615d8ebf9f7ed167

registerConfiguredStructures() should just register my structure as a configured structure whilst setupStructures() should add the separation settings.

What made me think it doesn't actually call the methods, is that I was simply putting a System.out.println("REACHED HERE"); and seeing if it printed. It did print if placed above event.enqueueWork but not when placed in the Structure methods.

[DireTook]

This should be it: https://github.com/DireTook/structureModRepo

[DireTook]

Definitely my bad for not realising I didn't register my STRUCTURES DeferredRegister.

I've moved the Configured Structure code to its own class so it should only be accessed after registry. Not sure if that's the best solution? But it does work now.

Thanks very much for the help!

[DireTook]

But since I'm using CONFIGURED_EXAMPLE_STRUCTURE in the biomeModification method and calling my new Configured Structure class using the setup method with event.enqueueWork, is a static initializer not the most efficient way?

  Quote

public void setup(final FMLCommonSetupEvent event) {
    event.enqueueWork(() -> {
        StructureInit.setupStructures();
        ConfiguredStructureInit.registerConfiguredStructures();
    }).whenComplete((v, err) -> {
        err.printStackTrace();
    });

 }

public void biomeModification(final BiomeLoadingEvent event) 
{
    event.getGeneration().getStructures().add(() -> ConfiguredStructureInit.CONFIGURED_EXAMPLE_STRUCTURE);
}

Expand  

 

Edited August 15, 2021 by DireTook

[DireTook]

I guess I mean neater. This way I don't have to potentially use return CONFIGURED_EXAMPLE_STRUCTURE and possibly merging methods together in one class or... tbh I'm not entirely sure how I'd successfully go about not doing it as a static initializer whilst still functioning but I'm after attempting to for bit, it seems like it'd be a lot messier